Type-mold.



A. L. KNIGHT.

TYPE MOLD.

APPLICATION FILED SEPT. 3, I915.

Patentd Mar.20,1917.

3 SHEETS-SHEET A.-L. KNIGHT.

TYPE MOLD APPLICATION FILED SEPT-8| 191s. 1,21 9,956. Patented Mar. 20, 1917.

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A. L. KNIGHT.

TYPE MOLD.

APPLICATION FILED SEPT. 8, 1915.

l ,2 l 9, 95 6 Patented Mar. 20, 1917.

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' UNITED STATES PATENT OFFICE.

AMOS L. KNIGHT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO LANSTON MONO- TYPE MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF VIRGINIA.

TYPE-MOLD.

To all whom it may concern:

Be it known that I, Amos L. KNIGHT, of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Type- Molds; and I do hereby declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being had to the accompanying drawings and to the figures and reference characters marked thereon.

The present invention relates to improvements in molds for type machines and especially to the class known as low quad molds for automatic type casting and composing machines, although features of the invention are applicable to molds for casting type in such machines other than of the low quad variety. Examples of molds of this character will be found in prior patents numbered 828350, August 14, 1906; 857,728, June 25, 1907; 962,411, June 28, 1910; 980,960, January 10, 1911, and the object of the present invention is to perfect and improve upon the mechanism embodied in the structures of said prior patents and to overcome certain defects which were found to exist in said structures when embodied in molds designed for practical commercial use in the hands of operators not especially skilled in mold construction and manufacture.

To the above ends the invention herein consists in certain novel details of construction and combinations and arrangements of parts, all as will be hereinafter described and particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a perspective view of a complete mold embodying the present invention;

Fig. 2 is a perspective view of a section of the mold blade, the latch and lever with associated parts, some of the parts being separated in order to illustrate their construction;

Fig. 2 is a sectional view of the carrier for the supplemental mold blade section and the latch for coupling the supplemental and main sections of the blade;

Fig. 3 is a top plan view of the complete mold with certain of the internal or underlying parts shown in dotted lines;

Specification of Letters Patent.

Application filed September 8, 1915.

Patented Mar. 20, 1917.

Serial No. 49,457.

Fig. 4 is an elevation looking at the rear edge of the mold or from a point of view at the bottom of Fig. 3;

Fig. 5 is an elevation of the right hand edge of the mold as viewed in Fig. 3; r

Fig. 6 is a sectional view substantially in the plane of the line 6-6 of Fig. 3 looking in the direction of the arrow;

Fig. 7 is a detail plan with portions removed and portions in section showing the main section of the mold blade and carrier for the supplemental section;

Figs. 8 and 9 are a plan and elevation, respectively, of the main section of the mold blade, carrier for the supplemental section, latch and latch operating lever;

Fig. 10 is a detail. sectional view showing the oil pad chambers in the type and cross blocks, respectively.

Like reference characters in the several figures indicate the same parts.

The present invention as illustrated in the drawings embodies a mold structure having many of the features and characteristics of the structures set forth in the prior. patents and which will be at once recognized by those skilled in the art. There is, for example, a base which is composed of a base plate 1, a waterbase and squaring block 2 and a front abutment 2. These parts. are preferably manufactured separately and suitably fitted together for permanent attachment, as will be hereinafter described. Mounted on the water base and fitting accurately against-'the'squaring block 2 are a pair of type blocks 3, ,which have heretofore in the art been designated as the fixed and adjustable type blocks, respectively,.but which, in'the present invention, are initially and permanently adjusted in the manufacture of the mold, it being designed according to the scheme of the present invention that said type blocks shall not thereafter be adjusted by the users but must be invariably returned to the factory for adjustment and fitting in connection with suitable gages specially designed for the purpose, inasmuch as their adjustment is a matter of extreme accuracy beyond the skill of ordinary mechanics and almost impossible of attainment without special appliances, but at the same time there mustbe a capacity for initial adjustment. 1

With the above objects in viewthe type blocks 3 and 4. arepermanently attached to the base and squaring block by means which when once the adjustment is effected can not be thereafter withdrawn without machine work which will permit the application of withdrawing appliances and which will indicate at once that the initial adjustment has been tampered with or that an attempt has been made to tamper with the same. Such an arrangement constitutes, in effect, a seal which must be broken and the breaking of the same will leave a clear indelible indication of the fact that an adjustment has been made or attempted, and being in possession of this knowledge the manufacturer is able to take proper precautions when the mold is returned to the factory for adjustment or repair. In the preferred construction the type blocks and base are connected by screws, indicated in Figs. 1, 3 and 5 at 5 and 6. These screws 5 and 6 are inserted to clamp the parts permanently in their adjusted position and when fully seated vith the heads countersunk, as shown clearly in dotted lines in Fig. 5, the nicks or slots are totally eliminated, usually .by a milling operation or cutting appliance which leaves the surfaces of the screw heads smooth and without irregularity, thus precluding the possibility of applying any instrumentality for removing the screws. To effect their removal, should it be necessary, it can only be accomplished by cutting nicks or slots in said heads by a machine operation and then removing the screws in the ordinary way, but any such operation leaves an indelible mark which indicates at once to the manufacturer that the permanent adjustment of the type blocks has been changed and enables him to take steps to overcome the defects and difficulties which may be incident thereto.

The type blocks form between their proximate faces a channel for the mold blade and also constitute two walls of the mold cavity, their upper faces on each side of the mold cavity being provided with seats 7 for the matrix and their forward faces forming one side of the channel in which the cross block 8 reciprocates. The other side of the channel for the cross block is formed by the front abutment 2 and the adjustable shoe 9 carried thereby and adapted to be advanced by set screws 10 located one approximately opposite the mold cavity and the other in proximity to the end of the channel toward which the cross-block moves, after a type has been cast, for the discharge of the sprue and to bring the type carrier into position to receive the type from the mold cavity, such operations being the ordinary well understood operations in type casting machines of the Lanston monotype system in connection with which this mold is primarily designed for use.

The mold blade, as is hereinbefore intimated, is composed of main and supplemental sections, both working between the proximate faces of the type blocks. The main section, indicated at 11, is the section which is controlled by the adjusting mechanism of the casting machine whereby the set size of the type is determined and the movements of the main section are communicated to the supplemental section 12 through a connecting mechanism which may be disconnected in order that the supplemental section may be held advanced when a short or low-quad type body is to be cast, thus reducing the height of the mold cavity in proportion to the thickness of the supple mental mold blade section. In accordance with the present invention the supplemental mold blade section 12 is pivotally mounted in such wise that it may independently conform to the proximate faces of the type blocks, thus eliminating a factor of wear which has heretofore proven somewhat annoying. The pivotal connection is preferably formed by a pivot pin 13 located on a supplemental blade section carrier 1-1, mounted alongside of the main section 11 of the blade and adapted to normally reciprocate in unison therewith, the two blade sections and the carrier being thus mounted to reciprocate in thesame channel between the proximate faces of the type blocks and through the squaring block, as heretofore, only in the present instance the supplemental section 12 is free to swing laterally on its pivotal connection 13 in so far as any such movement is permissible, and the freedom is suflicient to prevent lateral pressure through the connection. The carrier 14: is, as heretofore, provided with a transverse projection 15 adapted to extend through an opening in the main section 11, thus constituting an abutment or pick up which when the main section is advanced to dimension the mold cavity will cause the simultaneous advance of the supplemental section 12 with the end faces of the two sections in accurate alinement. The projection 15 is in the present invention utilized as the pivotal support for a latch 16, the forwardly extending portion 17 of which is adapted to engage a shoulder 18 (Fig. 7) on the main section to lock the two sections firmly together, and the forwardly extending portion of the latch is adapted to turn off to one side when the two sections are to be disconnected. The operating mechanism for the latch embodies a laterally extending arm 19 held retracted by a spring 20 connected at one end with the arm and at the opposite end with the carrier 14, and an operating lever 21 having an open bearing engaging a pin 21 in the carrier. The lower end of the lever 21 projects downwardly below the mold blade in position to cooperate with an operating lever in the casting machine which is thrown into action to exert forward pressure on the lower end of the lever whenever the supplemental section is to be advanced or held in advanced position for the casting of a short bodied type, this operation of the mechanism of the casting machine being in all respects similar to that of machines now in use and referred to in the patents hereinbefore mentioned.

The present arrangement differs from the prior structures in that the latch is now formed in such wise that the centers of its points of engagement are in the axial line of the mold blade, and consequently no lateral pressure is exerted by the latch tending to distort the parts and cause transverse pressure during the normal operation of the blade in the casting of ordinary type. This will be understood from Figs. 7 andS wherein it will be seen that the pivot 15 uniting the latch and projection 15 on the carrier 14 is at approximately the center line of the mold blade and the forward engaging faces at 17, 18, are approximately on the center line and pressure exerted through the latch will therefore be an axial pressure in the line of movement of the mold blade.

The mold blade is held down to its seat primarily by a retaining plate 22 Figs. 1, 2 and 8), a projection 23 on which enters a top slot or recess in the main-section of the mold blade. The supplemental section is held down in working position primarily by the cover plate 24 which overlaps a transverse projection 25 on the supplemental section, and in addition, when the supplemental section is in its advanced position the forward end of the lateral projection 25 enters a safety slot 26 formed in the right hand type block in proximity to the mold cavity, as shown in dotted lines in Figs. 3 and 7. When in its seat in the safety slot, the lateral projection 25 locks the supplemental section down to its position and prevents the possible entry of metal beneath the same even should the matrix fail to seat properly on the top of the said section. In other words, the provision of the safety slot and lateral projection 25 for cooperation therewith when the supplemental section is in its advanced position, serves as an abutment to prevent the lifting of the supplemental section under the pressure exerted by the molten metal in the mold cavity.

In addition to the plates 22 and 2 1 a plate 27 is provided forming a guide for the rear portion of the mold blade section opposite the plate 2 1- and in order that the supple mental blade section may readily seek and find its own seat between the type blocks avery slight clearance is provided at the rear end of the supplemental section between the proximate edges of the plates 24 and 27, such clearance being indicated by the slightly thickened or tapered lines 28. The mold blade stop 29 is secured to the outer face of the mold by screws, as usual, and projects through the opening in the mold blade forwardly of the projection 15 on the carrier 14;, such a stop being so positioned that it will arrest both of the mold blade sections with their forward ends flush with the front faces of the type blocks in which position the mold cavity is completely filled by the ends of the blade sections and any type body will have been ejected from the cavity.

In the patent hereinbefore referred to, Number 980,960, the structure described embodies type blocks having heat insulating slots therein for preventing the transmission of heat from the mold cavity directly through the type blocks whereby certain distortions were prevented. These heat insulating slots are employed in the present structure, as indicated at 30, and the effect of the employment of such slots is in the present instance augmented and distortions and irregular action due to variations in temperature almost completely eliminated by the employment of a circulating temperature controlling medium through those portions of the type blocks located between the heat insulating slots and the mold cavity. In the forming of the passages for the temperature controlling medium, such as cooling water, it is preferred that the passages shall be arranged vertically, or substantially parallel with the mold cavity, and to accomplish this result in a highly satisfactory and economical manner as well as to firmly anchor those portions of the type blocks, base screws 5, hereinbefore referred to, are extended up through the base and into the aforesaid portions of the type blocks and the passages or ducts for the water are formed by enlarging the intermediate portions of the screw sockets, as indicated by dotted lines 31, in Figs. 3 and 5, there being, of course, suitable connecting ducts 32 leading from the top and bottom portions of the ducts 31, as shown in dotted lines in Fig. 5, for conveying the water or cooling medium to and from the vertical ducts surrounding the fastening means or screws 5. The connecting passages 32 lead out to the bottom of the mold face as is common in this type of molds and the liquid may be made to circulate successively around the screws or through the ducts in both portions of the type blocks located intermediate the heat insulating slots and mold cavity, thus keeping under the undercut portion of the type blocks. Extending through between the proximate faces of the gate blocks is the usual jet opening and gate pusher 33, Fig. (5, which is adapted to be operated transversely of the cross block by a gate pusher cam 34 mounted in fixed position, as usual, in the bottom of the cross block channel. This gate pusher cam is adapted to advance the gate pusher to discharge the sprue or gate when the cross block is advanced after the casting of a type body, and it also determines the dimension of the jet opening for the admission of molten metal from the nozzle seat indicated in dotted lines at 35 to the bottom of the mold cavity. It is important that at the time the molten metal is injected the gate pusher shall be in its correct position and supported in that position by the pusher cam. It is also desirable that during the movements of the cross block the gate pusher shall exert no pressure upon the sprue or metal in the jet opening and to accomplish these results in the present structure the gate pusher cam is provided not only with the usual cam or inclined surface 36 for advancing the gate pusher when the sprue is to be discharged, but it is also provided with a second cam surface 37 for advancing the gate pusher when the latter is in position for the cast to be made, or in other words, when it is in alinement with the mold cavity and blade. The cam surface 37 is short and consequently as the cross block advances, pressure on the gate pusher is relieved almost immediately and the pusher does not again advance until the side of the jet opening is exposed for the discharge of the sprue. At an intermediate point the gate pusher cam 3% is also preferably provided on its opposite edge with a cam projection 38 which will insure the rearward movement of the gate pusher so that it will invariably be in contact with the cam surface 37 and in proper position. for dimensioning the jet opening when the parts are returned to casting position.

In the operation of molds involving the handling of molten metal, the freezing or solidification of such metal and the discharge of the metal from the mold and jet cavities, difficulty has been experienced in effecting lubrication because of the liability of the metal to enter the lubrication chambers, this difficulty being especially annoying in con nection with molds of this type because of the liability of so-called second shots or the bleeding of the uncongealed portion of the metal from the cast bodies, commonly called bleeding feet. To overcome this difficulty in the present structure the lubrication chambers are bridged by portions of the metal forming the cross blocks and type blocks at all points where the type metal contacts therewith, and the construction preferably adopted is illustrated in detail in Figs. 3 and 10. The lubrication chamber 39 in the type block 4 is at its lower end closed by a bridge portion 40 of the metal of the type block itself so that said block presents an unbroken metallic surface to the top of the sprue or jet opening and consequently no excess metal on the end of the jet can fill into the lubrication chamber and lap off the top of the gate blocks. The lubrication chamber in the cross block 8 is formed in the portion of the cross block known as the gate blocks, and is indicated in Fig. 10 at 41. From this drawing it will be noted that the said chamber is bridged at the top by a portion of the metal forming the cross block and indicated at d2, which bridge will form an unbroken metallic sur face to prevent the entry of metal from the mold cavity at the time when said lubrication chamber moves past the mold cavity during the travel of the cross block. The lubrication chambers 39 and all are, of course, as usual, filled by absorbent material which will retain and distribute the lubricant over the wearing surface, the chamber 39 being located in the type block at, distributes lubricant over the face of the cross block, and the chamber 41 being located in the cross block near its right hand end, as shown in dotted lines in Fig. 3 and distributes its lubricant between the underlying portions of the cross block and undercut portions of the type blocks.

The cross bloc-k reciprocates from the position shown in Fig. 3 toward the left and at one point in its travel the lubricant chamber will assume the position shown in I Fig. 10, that is to say, it will be substantially opposite the lubricant chamber 39 in the block 4:.

With the arrangement described, the distribution of the lubricant is effected at all points where it will be most effective in its action and at the same time the difiiculties heretofore encountered, due to accumulations of type metal in the lubricant chambers and passages and the consequent lapping and wear of the bearing surfaces, is entirely overcome.

It has hereinbefore been stated that the cross block 8 reciprocates in the channel formed between the forward faces of the type blocks 3 and 4 and the front abutment 2 with its shoe 9. In molds of this type as hereinbefore constructed the channel has been formed with parallel faces throughout its entire extent and the screws for adjusting the shoe 9 have been distributed on both sides of the line of the mold blade and mold cavity. In the present structure wear and distortions are to a considerable extent eliminated by forming the channel in such wise and so locating the pressure screws that the surface of the cross block and type blocks may be ground together throughout the area which includes the portion immediately around the mold cavity and that portion of the type block 4 which extends to the left from said cavity, while the portion of the type block 3 to the right of the cavity is formed with a slight clearance. The pressure screws are arranged to exert pressure for maintaining the cross block in its position in contact with the type block, one approximately in line with the mold blade and mold cavity and the other at the left hand side thereof.

As shown in the drawing, particularly in Fig. 3, the forward face of the type blocks throughout an area extending to the left hand side and including the portion immediately around the mold cavity, is ground in a single plane intersecting the mold cavity and parallel with the plane of the cooperating face of the cross block while the portion to the right of the mold cavity is given a slight clearance as indicated by the heavy line 48, this clearance being practically too small to be represented on the drawing, and tapers from nothing to approximately one and one-half thousandths of an inch. With this formation of the face of the type blocks the screws 10 for exerting pressure on the shoe 9 are located one approximately in line with the mold blade and mold cavity and the other at the left hand end of the shoe. The pressure is therefore exerted in an area which will maintain the accurate contact of the face of the cross block with the type blocks at the mold cavity and during the movement of the cross block to the position where the sprue is discharged and the mold cavity opened for the ejection of the type into the type carrier. The construction permits of a more accurate fitting of the parts and reduces wear and distortions under the varying conditions of heat encountered in the practical operation of the mold.

The mold, considered as a unit, is adapted to be rigidly secured in position on the frame of the casting machine and as heretofore constructed such molds have been located on the machine frame by suitable guide surfaces which cooperate with the base and have been clamped in position by screws passing into the base at right angles to its faces. Such construction, however, makes the application and removal of the mold to the casting machine frame an exceedingly awkward operation, inasmuch as the fastening screws are quite inaccessible and the positioning of the molds liable to be inaccurate. In accordance with the present invention the bottom face of the base is formed in a single plane and two edge faces are formed in planes at right angles to each other and at right angles to the bottom face. The two edge faces which are formed at right angles to each other are the faces 1 and l, in Figs. 1 and 3, which faces are adapted to seat against correspondingly positioned stop faces on the casting machine frame, and in order to hold the mold firmly seated in such position by fastening means which are exceedingly simple and accessible, screw seats are provided which extend diagonally downwardly from the edge faces opposite the faces l and 1*. These diagonal screw seats are indicated in Figs. 3 and 4 at 44 and 45, and they extend from the edge faces of the mold base opposite the edge faces 1 and 1", respectively, down through the bottom face 1 of the mold base, as shown clearly in Fig. 4, so that screws inserted through the seatswill clamp the mold firmly down and forwardly against the respective stops on the machine frame. Thus with two diagonally arranged clamping screws extending into two edge faces of the mold base, the entire structure is held firmly in position rigidly and accurately, a result which has heretofore been attainable only with the utmost difficulty and by the employment of awkwardly arranged screws for clamping the mold in three directions. The convenience in the employment of diagonally arranged screws will be at once apparent, for by their employment not only is the mold accurately positioned and firmly clamped, but the screws, themselves are readily accessible from above and will permit of the substitution of molds one for the other with the utmost convenience, especially as there are no parts of the structure which interfere with the insertion or re-' moval of such screws.

A mold embodying the invention herein set forth in practice demonstrates the fact that it produces type bodies of most accurate dimensions and form and free from defects caused by unequalheating and dis tortion of the mold parts, the wear on the operating parts is reduced, and confined to areas where it can not injure the operation of the mold. Each and every part of the mold is readily accessible for cleaning and at the same time the parts are so protected that the entry of dirt or type metal to any of the vital working mechanisms or surfaces is almost an impossibility.

WVhat is claimed is l. A type mold embodying blocks forming walls of the mold cavity and an adjustable sectional mold blade the sections whereof are pivotally connected whereby they are free to swing laterally with respect to each other.

2. A. type mold embodying blocks forming walls of the mold cavity and an adjustable sectional mold blade, the sections whereof are pivotally connected for independent lateral movement and detachable connecting means for effecting simultaneous longitudinal movement of the sections.

3. A type mold embodying blocks form ing walls of the mold cavity, a sectional mold blade embodying main and supplemental sections, a carrier for the supplemental section, a latch intermediate the carrier and main section and a pivotal connection intermediate the supplemental section and carrier.

1. A type mold embodying blocks forming walls of the mold cavity, a sectional mold blade embodying main and supplemental sections, a carrier for the supplemental section, a latch intermediate the carrier and main section and loose connections intermediate the carrier and supplemental section whereby the latter is free to be guided by the blocks.

5. A type mold embodying blocks forming walls of the mold cavity, a mold blade carrier mounted in ways to move toward and from the mold cavity, and a mold blade pivotally connected with the carrier and movable between the blocks for varying the S e of the cavity.

6. A type mold embodying blocks forming walls of the mold cavity, a sectional .iold blade movable between the blocks to dimension the cavity, and a latch intermediate the blade sections to connect them for uni tary movement having its respective centers of engagement in the axial line of the blade sections.

7. A type mold embodying blocks forming walls of the mold cavity, a sectional mold blade m vable between the blocks to dimension the cavity and a pivoted latch intermediate the blade sections to connect them for unitary movement, said latch having its pi otal center and center of engagement in the axial line of the blade sections.

8. A type mold embodying blades form ing walls of the mold cavity, a mold blade embodying main and supplemental sections for dimensioning the mold cavity, a carrier on which the supplemental section is carried, a latch pivotally mounted on the carrier and engaging the main blade section, the pivoted center and center of engagement of the latch being located in the axial line of the blade sections.

9. A type mold embodying blocks forming walls of the mold cavity, a mold blade embodying main and supplemental sections for dimensioning the mold cavity, a carrier for the supplemental blade section having a projection thereon extending into the main blade section, and a latch pivotally mounted on said projection and cooperating with the main blade section to lock the sections together.

10. A type mold embodying blocks forming walls of the'mold cavity, a sectional mold blade for dimensioning the cavity, a carrier for one of the blade sections, a spring-pressed latch pivoted on the carrier and cooperating with the other blade section to lock the sections togetherand a leverpivoted on the carrier and cooperating with the latch for releasing the same and holding the carrier and the blade section thereon advanced.

11. A type mold embodying blocks form ing walls of the mold cavity with heat insulating slots therein for retarding the transmission of heat beyond the slots and passages within the blocks at points intermediate the. slots and mold cavity for the circulation of a temperature regulating medium.

12. A type mold embodying blocks forming walls of the mold cavity and a mold blade channel, said blocks having heat insulating slots therein extending laterally from the blade channel and internal passages in said blocks at points intermediate the slots and mold cavity for the circulation of a temperature regulating medium.

13. A type mold embodying blocks forming walls of the mold cavity and a mold blade channel, said blocks having heat insulating slots therein extending laterally from the blade channel and internal passages extending vertically in said blocks at points intermediate the slots and mold cavity and horizontal passages communicating with the vertical passages for the circulation of a tem perature regulating medium.

14. A type mold embodying blocks forming walls of the mold cavity and a mold blade channel, said blocks having heat insulating slots for retarding the transmission of heat beyond the slots, a base on which the blocks are mounted, fastening members extending from the base into the blocks intermediate the slots and mold cavity, the openings for the fastening members being of greater diameter than the fastening members intermediate the ends of the latter to form passages for the circulation of temperature regulating medium in the blocks around said fastening members.

15. A type mold embodying-blocks forming walls of the mold cavity and a mold blade channel, said blocks having heat insulating slots for retarding the transmission of heat beyond the slots, a base on which the blocks are mounted, there being passages formed in the blocks intermediate the mold cavity and slots for the circulation of a cooling medium, and fastening members connecting the blocks, and base extending longi tudinally through the passages for the cooling medium.

16. In a type mold, the combination with the fixed blocks and mold blade, forming walls of the mold cavity, of a reciprocatory cross block forming one side of the mold cavity, said cross block having a jet opening therein adapted to register with the mold cavity, a jet pusher working transversely in the cross block and a fixed cam for operating said jet pusher, said cam having cam faces for advancing the pusher to discharge the jet gate and to retract the pusher and a second cam face for advancing and holding the pusher advanced a portion of its stroke when in position opposite the mold cavity.

17 In a type mold, the combination with the fixed blocks and mold blade, forming walls of the mold cavity, of a reciprocating cross block forming the front and bottom walls of said cavity, said cross block having an oil pad chamber therein below the level of the mold cavity, said chamber being bridged by the metal of the cross block in the line of its intersection of the mold cavity whereby metal from the cavity is excluded from the oil pad chamber.

18. In a type mold, the combination with the fixed blocks and mold blade, forming walls of the mold cavity, and a base on which said blocks are mounted having a nozzle seat therein below the mold cavity, of a reciprocatory cross block forming the front and bottom walls of said cavity, said cross block having a jet opening for admitting metal from the nozzle seat to the mold cavity and an oil pad chamber between the base and mold cavity, said oil pad chamber being bridged by the metal of the cross block in alinement with the mold cavity and nozzle seat whereby .metal from both the mold cavity and nozzle seat is excluded from the oil pad chamber.

19. In a type mold, the combination with the undercut fixed blocks forming walls of the mold cavity, one of said blocks having an oil pad chamber therein bridged at the bottom in line with the undercut face by the metal of the block and a mold blade working between the blocks to dimension the cavity, of a reciprocatory cross block forming the front wall of the cavity, gate blocks on the cross block extending beneath the undercut portions of the fixed blocks and forming between them the jet opening and a transversely movable jet pusher.

20. In a type mold, the combination with the cross block, base, sectional reciprocatory mold blade and lateral projection in proximity to the forward end of the upper blade section, of the fixed blocks forming the sides of the mold cavity and between which the mold blade reciprocates, one of said blocks being formed witha safety slot for the reception of the projection on the mold blade section when the latter is advanced, whereby said section is positively supported against upward pressure in the mold.

21. In a type mold, a base having a plane bottomface and plane edge faces on two edges at substantially right angles to each other and to the bottom face and screw sockets in the edge faces, opposite the said plane edge faces, said screw sockets extending diagonally through the bottom face whereby the pressure of screws in said sockets will be exerted in planes at an angle to both the plane edge and bottom faces.

22. A type mold embodying a base, front abutment, reciprocatory cross block having parallel faces, and type blocks forming with said abutment a channel for the cross block and between them a mold cavity and a channel for a mold blade, the face of one of said type blocks opposite the abutment being formed parallel with the face of the abutment and the corresponding face of the other type block adjacent the mold cavity being formed in alinement with the face of the first mentioned type block and at an angle thereto at a point removed from said cavity.

23. A type mold embodying type blocks forming between them a mold cavity and a channel for a mold blade, the major portion of the front face of said blocks extending in a single plane intersecting a mold cavity with a portion of said face at one side of the cavity formed in a plane at a slight angle to the first mentioned face, a front abutment, a reciprocatory cross block confined between the abutment and front face of the type blocks, a shoe interposed between the cross block and abutment and pressure screws for holding said shoe advanced against the cross block, said screws being located opposite that portion of the type block faces in the plane intersecting the mold cavity.

AMOS L. KNIGHT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

